试题与答案

从-2，-1，0，1这四个数中任取两个不同的数作为一次函数y=kx+b的一次项系

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题型：解答题

题目：

从-2，-1，0，1这四个数中任取两个不同的数作为一次函数y=kx+b的一次项系数k和常数项b．

（1）﹙易﹚用树状图（或列表法）表示k、b所有可能出现的结果；

（2）﹙中﹚求出使得一次函数y=kx+b图象不经过第三象限的概率．

答案：

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考点：一次函数的定义列举法求概率
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